What makes Debian unfit for Desktop use? Nothing. Debian is as good a Desktop OS as Mint, Ubuntu, Zorin and any other distro out there. It isn't just for tinkerers. Perhaps it doesn't have the amount of new user friendly features but I would rather use an OS that pushes me to learn than pushes me to be complacent and also pushes me to seek the 1-click options rather than spending 5 minutes to set something properly. Debian might not be everyone's cup of tea... but for those who it is their cup of tea Debian will never disappoint.